/*!
* 主题[A]
*/
[data-theme="a"]:after, 
[data-theme="a"]:before {color:#999;}
[data-theme="a"]:hover:after, [data-theme="a"]:hover:before {color:#333;}
/*!
* 主题[B]
*/
[data-theme="b"]:after, [data-theme="b"]:before {color:#f60;}